Autor: Jędrzejewski, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On cluster sets of connected functions
Autorzy:: Jędrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/121665.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:: funkcje matematyczne
przestrzeń topologiczna
topologia ogólna
mathematical function
topological space
general topology
Opis:: In the article we discuss some properties of a few classes of connected functions and cluster sets of functions from those classes.
Źródło:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2009, 14; 51-61
2450-9302
Pojawia się w:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: On connected functions in ordered spaces
Autorzy:: Jędrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/122022.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:: ordered space
sufficient conditions
przestrzeń uporządkowana
warunek wystarczający
Opis:: We consider some properties of functions defined in a topological space X with values in a topological space Y. The definitions 1, 2 and 3 define the same class of functions when X and Y are equal to R with natural topology. In this article we discuss some properties of those classes and give some sufficient conditions for the space X in which real functions defined in X form the same class.
Źródło:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2010, 15; 51-58
2450-9302
Pojawia się w:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: On monotonicity of real functions
Autorzy:: Jędrzejewski, J. M.
Powiązania:: https://bibliotekanauki.pl/articles/121651.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:: monotoniczność funkcji
funkcje rzeczywiste
funkcje ciągłe
monotonicity of functions
real functions
continuous functions
Opis:: Monotonicity of functions were of great interest of many mathematicians. Starting from the well known theorem of monotonicity of a differentiable function one can get quite sophisticated results. We give a survey of results when thesis of them is continuous and monotone function. Someone can ask why it should be continuous. Even a differentiable functions but not at the only point of its domain with positive derivative need not be non-decreasing. That is why we want to look for theorems for continuous functions.
Źródło:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2017, 22; 49-60
2450-9302
Pojawia się w:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Asymmetry in real functions theory
Autorzy:: Jędrzejewski, J. M.
Powiązania:: https://bibliotekanauki.pl/articles/950241.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:: real functions
real functions theory
asymmetry
funkcje rzeczywiste
teoria funkcji rzeczywistych
asymetria
Opis:: Since the beginning of the XX century many authors considered characterizations of local properties for real functions of a real variable which have been defined as global properties. We present a short survey of local properties of the well known global ones and consider of how small/big the set of asymmetrical behaviour of a function must be.
Źródło:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2018, 23; 11-24
2450-9302
Pojawia się w:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Why the area of a rectangle is calculated by the formula P = a ∙ b?
Autorzy:: Jędrzejewski, J.
Tyrala, I.
Powiązania:: https://bibliotekanauki.pl/articles/122056.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:: nauczanie matematyki
prostokąt
pole powierzchni prostokąta
teoria miary
teaching mathematics
rectangle
area of rectangle
measure theory
Opis:: It is evident for many people that the area of a rectangle can be calculated according to the very well known formula: P = a ∙ b. We, mathematicians do believe in no statement without the proof. Then we can ask whether it is possible to prove that this formula is correct. This article answers to that question.
Źródło:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2014, 19; 67-70
2450-9302
Pojawia się w:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Vectors in school mathematics
Autorzy:: Jędrzejewski, J.
Kostrzewski, T.
Powiązania:: https://bibliotekanauki.pl/articles/951863.pdf
Data publikacji:: 2015
Wydawca:: Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:: wektory
matematyka szkolna
znaczenie wektorów
vectors
school mathematics
meaning of vectors
Opis:: Vectors have several meanings in the science. Mathematicians, physicists and other scientists make use of the notion of a vector. The notions they make use of are different in different subjects. Here we present different meanings of vectors and give some hints how to understand them in different subjects of science.
Źródło:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2015, 20; 9-13
2450-9302
Pojawia się w:: Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Evaluation of different approaches to 3D numerical model development of the contact zone between elementary asperities and flat surface
Autorzy:: Maciolka, P.
Jedrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/99568.pdf
Data publikacji:: 2017
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: flat surfaces
contact
roughness
FEM
3D model
Opis:: This paper presents two triaxial finite element (FE) models: a “full model” and a “quarter model”, representing the contact between the specimen’s rough surface and the ideally smooth and flat surface of the punch. Models have a contact zone that represents the topography of the real surface and has elastoplastic properties close to those of the real contact. The contact zone was entirely modelled on the basis of roughness measurements performed on a real milled specimen made of 5083 aluminium alloy. The developmentof the FE models, the stages in their refinement and the interlinking of the contact zone with the material of the specimen are described. The results of the computed deformations occurring during the specimen contact loading with the punch were compared with the experimental results. The possible causes of the observed deviations of the computer simulation results from the experimental ones were discussed. The models were used to analyse the effect of the specimen’s material properties, i.e. Young’s modulus, yield strength, compressive strength and material hardening, on the deformations in the contact. On this basis a procedure for predicting the parameters describing the contact characteristic in cases of changes in the properties of the subsurface zone is proposed.
Źródło:: Journal of Machine Engineering; 2017, 17, 4; 40-53
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Discussion of Machine Tool Intelligence, Based on Selected Concepts and Research
Autorzy:: Jędrzejewski, J.
Kwaśny, W.
Powiązania:: https://bibliotekanauki.pl/articles/99824.pdf
Data publikacji:: 2015
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
intelligence
learning
intelligent avoiding
collisions
trajectories
real time
Opis:: This paper discusses the need to create intelligent machine tools, the expected properties of such machine tools and the benefits they will bring to business and the development of manufacturing. The basis for machine tool intelligence, and the evolution of machine tools towards the development of their intelligent functions, with a special emphasis on control, digitization and virtualization systems, the role of the STP-NC standard, and the prediction of machine tool operating properties, are presented. The arising concepts of the development of intelligent machine tool functions, which take into account the monitoring and planning of a collisionless tool path, are discussed. The approach to achieving real time and the intelligent machine tool is described for copy milling. Also the directions of implementing intelligent functions by machine tool manufacturers are presented using the MAZAK Corporation as an example.
Źródło:: Journal of Machine Engineering; 2015, 15, 4; 5-26
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Knowledge base and assumptions for holistic modelling aimed at reducing axial errors of complex machine tools
Autorzy:: Jędrzejewski, J.
Kwaśny, W.
Powiązania:: https://bibliotekanauki.pl/articles/99902.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: holistic model
machine tool
power losses
error
Opis:: The paper presents the idea and need for the holistic modelling of machine tools. The complexity of such modelling is illustrated for a 5-axis machining centre. The need to model errors in the controllable axes of machine tools with rotational and linear motion drives is indicated. The physical dependences having a bearing on the state of deformations produced by temperature and dynamic forces, as well as the assumptions and computational modelsof shift generation in the high-speed bearing sets of spindles, and models of the behaviour of the ball screw are presented. Moreover, the results of experimental studies of the thermal behaviour of linear motor sets and guideways with rolling blocks are reported.
Źródło:: Journal of Machine Engineering; 2013, 13, 2; 7-25
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Development of Machine Tool Operational Properties
Autorzy:: Jędrzejewski, J.
Kwaśny, W.
Powiązania:: https://bibliotekanauki.pl/articles/99436.pdf
Data publikacji:: 2015
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
intelligence
accuracy
holistic modelling
simulation
thermal properties
Opis:: This paper presents the main directions in the development of machine tools and the practical implementations of new technologies by machine tool producers, aimed at meeting the business requirements. The possibilities of applying intelligent functions in high-performance machine tools and the trends in the development of intelligent machine tools are discussed. The vital importance of the holistic modelling and numerical simulation of the operational properties of machine tools at all the stages of their creation and the necessity of integrating the machine tool with the control system and the process during simulation and virtualization are highlighted.
Źródło:: Journal of Machine Engineering; 2015, 15, 1; 5-24
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: On a mathematical model of a heat exchange process in conductors
Matematyczny model procesu wymiany ciepła w przewodnikach
Autorzy:: Jędrzejewski, J.
Skopiec, J.
Powiązania:: https://bibliotekanauki.pl/articles/741307.pdf
Data publikacji:: 1974
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:: Applicationes Mathematicae; 1974-1975, 14, 3; 403-413
1233-7234
Pojawia się w:: Applicationes Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Development of High Performance Machine Tools
Autorzy:: Jędrzejewski, J.
Kwaśny, W.
Powiązania:: https://bibliotekanauki.pl/articles/971145.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
development
precision
performance
intelligence
Opis:: This paper presents a general characteristic of modern cutting machine tools and their role in achieving high machining performance. The determinants of machine tool development, stemming from the constant development of products and their complexity and from market demands, are discussed in detail. Special attention is devoted to the improvement of the machine tool structure and its variations created in response to the continuous and flexible increase in machining efficiency. The importance of developing multitask, hybrid and reconfigurable structures is discussed. The essence of the development of multi-spindle units as the modules having a decisive influence on machining performance, precision and costs is described. Moreover, trends in the development of feed units and distance measuring systems are presented.
Źródło:: Journal of Machine Engineering; 2009, 9, 2; 5-31
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Study on reducing energy consumption in manufacturing systems
Autorzy:: Jędrzejewski, J.
Kwaśny, W.
Powiązania:: https://bibliotekanauki.pl/articles/99980.pdf
Data publikacji:: 2011
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
processes
energy consumption
Opis:: The paper presents the complexity and importance of energy saving in industry, manufacturing facilities, machine tools and machining processes. The increasing energy demand and the necessity of conscious energy use are highlighted. Problems relating to the reduction of energy consumption by machine tools and manufacturing facilities, the necessity of basing new energy-efficient designs on knowledge, the accurate modelling of power losses and the use of intelligent energy consumption control with special regard to the drives of controllable axes are discussed. of reducing energy consumption by machine tools and manufacturing processes is indicated.
Źródło:: Journal of Machine Engineering; 2011, 11, 3; 7-20
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Comparison of two FEA-based approaches in prediction of workpiece-fixture static behaviour
Autorzy:: Grochowski, M.
Jedrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1429289.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: workpiece
fixture
quasistatic analysis
Opis:: Simulating of workpiece and fixture behaviour is commonly done with the use of Finite Element Analyses. In the most, if not all, cases researchers usually use traditional implicit integration scheme FEM codes (e.g. ANSYS, ABAQUS/Standard, NASTRAN, FEAP). In this paper a different approach is proposed. FEM code of ABAQUS/Explicit, based on explicit integration of equations of the motion is used to predict workpiece behaviour during alignment and fixing process in quasistatic state. Comparison of results obtained using both implicit and explicit techniques is also presented, results and differences are discussed.
Źródło:: Journal of Machine Engineering; 2008, 8, 3; 54-65
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Modelling the behaviour of a contact layer between the workpiece and a locator
Autorzy:: Maciolka, P.
Jedrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1429343.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: roughness
contact
model
Opis:: The assurance of high precision alignment of workpieces with low stiffness requires thorough knowledge about the phenomena taking place in the contact area under the influence of forces exerted by actuators. It is indispensable to utilise the model of a contact and deformations taking place in it. In order to solve the problem of contact, the contact geometry was modelled by means of a flat and rough surface model based on stereometric measurements, as well as by means of the finite element method (FEM). In a FEM method, a spherical structure of the surface layer was assumed and only one zone was taken into consideration, i.e. 0.4.Rt (maximum surface roughness). Zone structure allows easy changing of mechanical properties of material during the introduction of data defined by a strengthening curve in the plastic region. The possibility of expanding the model by consecutive zones allows taking into consideration the physical properties in complex analyses of the surface layer. This paper presents the problem of contact related to the alignment and fixing process, a model of contact deformations between a flat and a rough surface, as well as the algorithm for determining the model of a surface profile according to the bearing ratio curve.
Źródło:: Journal of Machine Engineering; 2008, 8, 3; 42-53
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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